Boller-mill



F. E. MARCY.

ROLLER MILL.

APPLICATION FILED IAILZfl. 1919. RENEWED OCT. 13. 1920.

Pktented Dec. 7, 1920.

2 SHEETS-SHEET i.

//v VEN ro/a flank Elia y- BY fi/ A T TORNE 7.

WITNESSES: I

M Q. I

F. E. MARCY.

ROLLER MILL.

APPLICATION nuzo lAN.25, 19:9. RENEWED on. 13. 1320.

1,361,601, Patented Dec. 7, 1920.

2 SHEETS-SHEET 2- //V VE N TOR.

AM 4% p I ATTOR/VE X PATENT OFFICE."

UNITED srATas- FRANK E. MABCY, OF SALT LAKE CITY, UTAH.

BQLLEB-MILL.

To all whom it may concern:

Be it known that I, FRANK E. MAROY, citizen of the United States, residin Salt Lake City, in the county of Salt and State of Utah, have invented certain new anduseful Improvements in "Roller- Mills, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

The present invention is directed to improvements in roller (or rod) mills which,- as well understood in the art, belong to that class of crushing or disintegrating apparatus wherein the material is ground by means of freely moving crushing bodies in the form of rods or rollers extended longitudinally substantially the length of the crushing compartment of the mill, the latter being 1n the form of a suitable tumbling barrel, drum, or equivalent tubular container or treatment vesselrotated about a fixed axis, the opposite ends of the barrel'being provided respectively with intake or feed, and discharge openings for the material. The present improvement is concerned with that type of mill in which the discharge end is left open and unobstructed (in 'contradistinction to the trunnion overflow type of mill) for the passage of the material therethrough and for the purpose of affording access to the interior of the mill at all times, and permitting inspection of its contents at any stage of the grinding operation. A mill of the open end type here referred to is preferably provided with a flange or diaphragm at the point of discharge, said flange serving to build up or raise the pulp line in the mill and thereby permitting the charge of material to be subjected to the grinding action of the rods (or their equivalent) for a somewhat longer period of time thanwould be the case were the flange dispensed with and the pulp line allowed to drop. It is desirablejn a mill of the character referred to,to provide means for preventing the crushing bodies from being projected out of the mill through the open discharge end, or through the available opening defined by the inner or overflow edge of the flange aforesaid; and in the present embodiment of my invention I resort to a suitable rod-intercepting dooror guard mounted on the barrel in such a waythat while it permits of the free and uninterrupted discharge of the Specification of Letters Patent.

a at precipitation of the crushing bodies from ke the mill. A guard or rod-interceptingmem- 2 is an end elevation lookin Patented Dec. 7, 1920.

Application flied January 25, 1919, Serial No. 273,097. Renewed October 13, 1920. Serial 170. 416,778.

material from the mill, it yet serves as an effective barrier against the projection or her of the general character referred to forms one of the novel features of the subect-matter of my pending application filed August 14, 1918, Serial Number 249,901, the guard in that case being however disconnected from the barrel and in movable relationthereto, whereas the guard in my present lmprovement is secured to the barrel and therefore in fixed relation thereto,'the

' barrel and guard revolving as a unit. As

intimated above, the guard partakes of the nature of a door which may be manipulated so as to uncover the opening partially closed thereby, for purposes of inspection of the mill contents or for thepurpose of gaining access to the crushin compartment of the mill at any stage of tile grinding operation; The present improvement is characterized mainly by simplicity of construction, and the variety of forms the same may assume without a departure from the basic principle of the invention. The advantages of the improvement will be clearly apparent from the following detailed description in connection with the accompanying drawin in which *igure 1 represents a side elevation of a mill with parts broken away showing one form of my invention applied thereto; Fig. toward the discharge end; Fig. 3 is a sectional side elevation of the discharge end of a mill show- 7 ing another form of my invention; Fig. 4; is an end view of Fig. 3; Fig. 5 is a vertical middle longitudinal section of a mill showing a further modification of my invention; Fig. 6 is a similar view showing a further modification; Fig. 7 is a view similar to Fig. 5 showing another modification; Fig. 8 is an end view of Fig. 7 Fig. 9 is a view similar to Fig. 5 showlng a modification in which the discharge slot is formed in the flange at the open end of the mill; Fig. 10 is an end view of Fig. 9; Fig. 11 is a view similar to Fig. 9 showing a modification in which the discharge slot is formed in the door or rod-intercepting member; and Fig. 12 is an end view of Fig. 11.

Referring to the drawings, and for the present to Figs. 1 and 2, D, represents a (preferably) cylindrical container, drum, tumbling barrel or equivalent tubular memher, slightly pitched to the horizontal h, the crushing compartment C of the mill or barrel containing the usual complement of grinding. bodies which in the present example are in the form of longitudinally extended, loose, grinding rods or rollers 1 free to tumble in the barrel as the latter rotates in the grinding operation of the mill, only a portion of the entire complement of rods being herein illustrated. The wall liner 2 is provided with inclined lifters 3 which operate to first lift the grinding rods and then release them in such a way as to cause up the pulp line, and the guard or rod-intercepting plate or door to which the present improvement is in the main directed. In the present example the mill is provided with a hollow feed or intake trunnion 5 equi ed with a conventional scoop feeder 6, w lch scoops up the pulp from a suitable launder 7, the material discharged from the mill being caught in a launder 8 as well understood in the art.

In the present improvement the guard or rod-intercepting member is carried by the barrel D and assumes the form of a door 9 preferably hinged to the barrel in front of the flange 4, the diameter of the door being smaller than the diameter of the discharge opening defined by the inner edge of the flange, whereby there is formed between the flange .and door an annular slot or passageway 0 for the discharge of the material from the mill. Since the hinge axis of the door is necessarily located at a point exterior to the periphery of the door, it follows that the continuity of the slot- 0 will be interrupted at least at the point where the rib t of the door forming one of the elements or leaves of the hinge structure,- spans the slot to connect with the hinge pin a. In the example before us the rib t is likewise extended in the opposite direction across the slot or gap 0, terminating in an outwardly bent fingerhold t at which point the door is secured to the flange 4 by a cap-screw 10 or in any a other suitable mechanical manner. The slot 0 is thus interrupted by the rib t at two points; but this interruption in no wise interferes with the free discharge of the.

pulp from the mill. Preferably, the periphery of the, door 9 is made beveled or conical, the cone flaring outwardly, the inner edges of the flange 4 and its liner'4" beinggiven a corresponding slope so that the slot 0 is virtually conical as clearly shown in Fig.. 1. The pulp which builds upto the dotted line a: indicated in Fig. 1 flows over the sloping edges of the flange 4 and liner 4 through the slot 0 into the launder 8 as indicated by the arrows. As stated above,

the function of the door or guard 9 is to intercept any rod tending to precipitate out of the mill during the grinding operation;

but the door may be swung open at anystage of the grinding operation to allow for the inspection of the mill contents, to make necessary repairs, and the like. The diameter of the door will necessarily depend on the width of the pulp up-building flange 4; and where such a flange is dwarfed or entirely absent (as may be the case in mills sufliciently pitched to dispense with the flange) the door is corres ondingly enlarged,

suflicient space being le t however between the periphery of the door and the walls of the crushing compartment C to form an annular (or equivalent) slot or passage-way for the discharge of the material. Or, the door maybe made large enough to entirely close the barrel opening and an interrupted annular (or equivalent) slot formed in the door at any desired pulp-line to permit the material to discharge therethrough.

The operation is the same as in all mills of the general type or class to which the present mill belongs. The mill or barrel is given a rotation in the direction indicated by the arrows in Fig. 1, the wall nearest the reader sweeping upward while the wall farthest away is descendin The grinding rods 1 tumble freely across t e crushmg compartment C, but since in their tumbling movements they are constantly being directed away from the discharge openin by th combined action of the pitch of t e mill, and the inclined lifters, it follows that the rods will remain normally out of contact with the door or guard 9, but any rod which happens to strike the door 9 will of course necessaril be intercepted and prevented from falllng out of the mill. The impact of the rods against the door is however not frequent as the rods are in the main kept in the mill by the pitch of the mill, by the deflecting action of the lifters 3, and by the flange 4. The pulp enters the crushing compartment C through the hollow feed trunnion 5 and the finished product discharges discharging into the launder 21, the pulp line a: being built up by the member 20 the same as in the form first described. In this 'being ormed between the .door and the flange the same as in the first form, the door being provided with a lug or arm 22 opposite its hinge axis w ich is secured to the lip 20 by means of a ap-screw 23.

In Fig. 5 is shown a barrel or mill T provided at the discharge end with a frustoconical flange 30 to which is hinged a door 31 normally held fastened by a cap-screw d, an annularslot 6 between the door periphery and inner/edge of the flange being'formed for the discharge of the material. The

flange 30 is formed with a thickened ortion.

32 to afford support for the screw d. n Fig. 6 is shown a barrel T the discharge end of which is provided with a combined plane and frusto-conical flange 33 to which is hinged a door 34 normally held fastened by a capscrew (Z, an annular discharge slot 71 being formed between the periphery of the door and inner edge of the flange. n Figs. 7 and 8 is shown a barrel, or mill T provided at its discharge end with a plane flange35, within the confines of which is normally disposed a door 36, said door in this instance being detachable from th barrel and held in place while in service position, by the cap-screws d passed through the opposite terminals of the central ribs 2? formed on. the door. The annular slot 8 between the door and flange allows for the flow of the pulp out of the barrel.

In all the forms above referred to, the discharge slot 0 or its equivalent is formedaround the door 9 or its equivalent, that is to say-betw en the periphery of the door and the walls of the opening defined by the flange- 4 or its equivalent (or the walls of the crushing compartment where the flange is absent).

We may however, as examples of extreme modifications. locate the discharge slot either in the flange or in the door, in each of which cases the slot would still be between the walls of the crushin compartment and the center of the door as in the preceding forms. Thus in Figs. 9 and 10 is shown a barrel T the open end of which is provided with a flange 3'4 formed with an annular interrupted discharge slot to at such a point as to raise the pulp line 00 the desired degree, the hingeddoor 38 in this case closing the opening of the flange and being normally held locked by the cap-screw d. On the other hand, in Figs. 11 and 12 is shown a barrel T provided with a flange 39 at its open end, the opening defined by the flange being normally closed by the hinged door 40 in which at the proper pulp line is formed an annular interrupted discharge slot w, the door when closed being fastened by a cap screw (Z as shown. There are other modifications;- that are possible, but which need not be herein illustrated because readily suggesting themselves to the skilled mechanic. In all the forms described the door or rod-intercepting member or plate is disposed across the rotation axis of the mill or barrel, said axis passing greferably oli through the center of the door. 11 all the forms described the discharge slot (0, 0', z', 11', '8, u, w,) conforms to the position desired for the pulp line, which, of course, may be raised or lowered accordin to circum-. stances, and according to con itions to be met with in practice. The lowest position for the pulp-line is reached when the flange 4 or its equivalent disappears. The resent invention of course is not to be restrlcted in' its application to mills with a pulp-line of a definite height, but is to be unders ood as applicable to mills having any range of 111 line positions from m'l to the highest w ic may betolerated in practice.

Features shown in the drawing but not alluded to are either well understood in the art, or form the subject-matter of other pending applications filed by me.

' aving described my invention what I claim is:

1. In a mill of. the character described, a tumbling barrel having a feed end and a normally open discharge end,- an inwardly projecting flange at the discharge end, the inner edge of the flange defining the available opening through which the material may fiow, freely moving grinding bodies in the barrel, and a door or plate secured to the barrel having a maximum dimension less than the diameter of the opening aforesaid and adapted to be moved across said opening to form with the boundaries thereof an annular passageway for the direct discharge of t e material.

2. In a mill of the character described, a tumbling barrel having a feed end and a normally open dischar e end, an inwardly projecting flange at t e discharge end, a door secured to the barrel and closing across the plane of disposition of the flange, a suitable passage-way being formed between the inner edge of the flange and the center of the d or, for the direct discharge of the material.

3. In a mill of the character described, a tumbling barrel having an open discharge end surrounded by a flange operating to raise the pulp line, and providedwith an outwardly flaring lip leading from the inner edge of the flange, and a door or movable plate coiiperating with the lip and forming therewith an annular passageway for the discharge of the material.

In testimony whereof I aflix my signature, 120 in presence of two witnesses.

FRANK E. MARGY.

Witnesses VIOLA P. DRUSHAL, C. L. CUNDIGK. 

